Exhibition hall projection demonstration device and method

The invention discloses an exhibition hall projection demonstration device and method, and relates to the technical field of advertisement projection. The device comprises a top box, an unmanned aerial vehicle is fixedly installed at the top of the top box, rotor wings of the unmanned aerial vehicle do not exceed the back face of the top box, the device further comprises a projection roller, the projection roller is located below the top box, projection cloth is wound around the outer side of the projection roller, a bottom roller is arranged at the bottom of the projection cloth, and locking sleeves are rotationally installed at the two ends of the projection roller. The two locking sleeves are fixedly connected through a connecting frame, and a projector is installed at the bottom of the connecting frame. According to the projection device, the winding and unwinding rope is loosened, the bottom roller drives the winding and unwinding rope to descend under the action of gravity, the winding and unwinding rop